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  #11  
Old 05-13-2014, 06:03 PM
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The difference in pressure specs could just be different load ratings.

Any 8 ply rating light truck tire runs at 65 psi for max load capacity.

10 ply tires run at a whopping 80psi for max capacity, as has been said.

Your other tires are probably a 6 ply or less, therefore requiring less pressure.
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  #12  
Old 05-13-2014, 06:09 PM
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Originally Posted by SuperCab View Post
The difference in pressure specs could just be different load ratings.

Any 8 ply rating light truck tire runs at 65 psi for max load capacity.

10 ply tires run at a whopping 80psi for max capacity, as has been said.

Your other tires are probably a 6 ply or less, therefore requiring less pressure.
Ahhh...thanks for the clarity....didn't think there would be that much difference between the Interco Super Swampers and the Nitto Mud Grapplers, but I guess there is.
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  #13  
Old 05-13-2014, 07:16 PM
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Hi Ken,
so you can see by the replies that you're good to run anywhere between 15-20psi Below the Max Load rating. You don't use your beautiful trucks to haul , do you...
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  #14  
Old 05-14-2014, 06:29 AM
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Originally Posted by amkatt1 View Post
Hi Ken,
so you can see by the replies that you're good to run anywhere between 15-20psi Below the Max Load rating. You don't use your beautiful trucks to haul , do you...
The only hauling this thing does is me and my boys!

So do I let some air out? Or just leave it alone at 65?
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  #15  
Old 05-14-2014, 08:31 AM
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Running max psi without a load will cause it to bounce like an over full basketball. PSI is a correlation to load index and sidewall/ply construction...ie bias/radial, nylon/Kevlar/steel, ply count, etc. Intent of a TSL is to be able to flex (even the radials), and 65psi doesn't promote that...they'll have a softer rubber compound as well that will allow more flex. I'd assume at 65lbs is a load range D tire and the Swampers are probably a C. Typically, I like my tires to be 10-15% less than max psi...but I suppose technically you need to get a weight at each corner and figure what percentage that is of the max load capacity of the tire, then multiply that percentage by the max psi. But no one does that, they either back off a certain percentage or fill that baby right up to the max psi.
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  #16  
Old 05-14-2014, 08:34 AM
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Originally Posted by UTfball68 View Post
Running max psi without a load will cause it to bounce like an over full basketball. PSI is a correlation to load index and sidewall/ply construction...ie bias/radial, nylon/Kevlar/steel, ply count, etc. Intent of a TSL is to be able to flex (even the radials), and 65psi doesn't promote that...they'll have a softer rubber compound as well that will allow more flex. I'd assume at 65lbs is a load range D tire and the Swampers are probably a C. Typically, I like my tires to be 10-15% less than max psi...but I suppose technically you need to get a weight at each corner and figure what percentage that is of the max load capacity of the tire, then multiply that percentage by the max psi. But no one does that, they either back off a certain percentage or fill that baby right up to the max psi.
Ok, going to let some air out for sure now....thanks Ben....and thanks everyone else.....always learning with vehicles...love it!
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